[PATCH] ieee80211 quality scaling algorithm extension handler

Incorporated Bill Moss' quality scaling algorithm into default wireless
extension handler.

Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

2 files changed, 33 insertions, 10 deletions

diff --git a/include/net/ieee80211.h b/include/net/ieee80211.h
index dc36b1be6745..ce966b7ff563 100644
--- a/include/net/ieee80211.h
+++ b/include/net/ieee80211.h
@@ -719,6 +719,9 @@ struct ieee80211_device {
         int freq_band;  /* 2.4Ghz, 5.2Ghz, Mixed */
         int abg_ture;   /* ABG flag              */
 
+        int perfect_rssi;
+        int worst_rssi;
+
         /* Callback functions */
         void (*set_security)(struct net_device *dev,
                              struct ieee80211_security *sec);
diff --git a/net/ieee80211/ieee80211_wx.c b/net/ieee80211/ieee80211_wx.c
index 94882f39b072..04f0897b0653 100644
--- a/net/ieee80211/ieee80211_wx.c
+++ b/net/ieee80211/ieee80211_wx.c
@@ -140,18 +140,38 @@ static inline char *ipw2100_translate_scan(struct ieee80211_device *ieee,
                 start = iwe_stream_add_point(start, stop, &iwe, custom);
 
         /* Add quality statistics */
-        /* TODO: Fix these values... */
         iwe.cmd = IWEVQUAL;
-        iwe.u.qual.qual = network->stats.signal;
-        iwe.u.qual.level = network->stats.rssi;
-        iwe.u.qual.noise = network->stats.noise;
-        iwe.u.qual.updated = network->stats.mask & IEEE80211_STATMASK_WEMASK;
-        if (!(network->stats.mask & IEEE80211_STATMASK_RSSI))
-                iwe.u.qual.updated |= IW_QUAL_LEVEL_INVALID;
-        if (!(network->stats.mask & IEEE80211_STATMASK_NOISE))
+        iwe.u.qual.updated = IW_QUAL_QUAL_UPDATED | IW_QUAL_LEVEL_UPDATED |
+            IW_QUAL_NOISE_UPDATED;
+
+        if (!(network->stats.mask & IEEE80211_STATMASK_RSSI)) {
+                iwe.u.qual.updated |= IW_QUAL_QUAL_INVALID |
+                    IW_QUAL_LEVEL_INVALID;
+                iwe.u.qual.qual = 0;
+                iwe.u.qual.level = 0;
+        } else {
+                iwe.u.qual.level = network->stats.rssi;
+                iwe.u.qual.qual =
+                    (100 *
+                     (ieee->perfect_rssi - ieee->worst_rssi) *
+                     (ieee->perfect_rssi - ieee->worst_rssi) -
+                     (ieee->perfect_rssi - network->stats.rssi) *
+                     (15 * (ieee->perfect_rssi - ieee->worst_rssi) +
+                      62 * (ieee->perfect_rssi - network->stats.rssi))) /
+                    ((ieee->perfect_rssi - ieee->worst_rssi) *
+                     (ieee->perfect_rssi - ieee->worst_rssi));
+                if (iwe.u.qual.qual > 100)
+                        iwe.u.qual.qual = 100;
+                else if (iwe.u.qual.qual < 1)
+                        iwe.u.qual.qual = 0;
+        }
+
+        if (!(network->stats.mask & IEEE80211_STATMASK_NOISE)) {
                 iwe.u.qual.updated |= IW_QUAL_NOISE_INVALID;
-        if (!(network->stats.mask & IEEE80211_STATMASK_SIGNAL))
-                iwe.u.qual.updated |= IW_QUAL_QUAL_INVALID;
+                iwe.u.qual.noise = 0;
+        } else {
+                iwe.u.qual.noise = network->stats.noise;
+        }
 
         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);